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| author | Hsin-Yi Wang <hsinyi@chromium.org> | 2019-08-23 14:24:50 +0800 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2019-08-23 16:39:16 +0100 |
| commit | e112b032a72c78f15d0c803c5dc6be444c2e6c66 (patch) | |
| tree | 1356af931f59efe60649b3ab929fe822ebfe3e5b /arch/arm64/kernel/setup.c | |
| parent | e21a712a9685488f5ce80495b37b9fdbe96c230d (diff) | |
| download | lwn-e112b032a72c78f15d0c803c5dc6be444c2e6c66.tar.gz lwn-e112b032a72c78f15d0c803c5dc6be444c2e6c66.zip | |
arm64: map FDT as RW for early_init_dt_scan()
Currently in arm64, FDT is mapped to RO before it's passed to
early_init_dt_scan(). However, there might be some codes
(eg. commit "fdt: add support for rng-seed") that need to modify FDT
during init. Map FDT to RO after early fixups are done.
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Reviewed-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch/arm64/kernel/setup.c')
| -rw-r--r-- | arch/arm64/kernel/setup.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 9c4bad7d7131..25f5127210f8 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -170,9 +170,13 @@ static void __init smp_build_mpidr_hash(void) static void __init setup_machine_fdt(phys_addr_t dt_phys) { - void *dt_virt = fixmap_remap_fdt(dt_phys); + int size; + void *dt_virt = fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL); const char *name; + if (dt_virt) + memblock_reserve(dt_phys, size); + if (!dt_virt || !early_init_dt_scan(dt_virt)) { pr_crit("\n" "Error: invalid device tree blob at physical address %pa (virtual address 0x%p)\n" @@ -184,6 +188,9 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys) cpu_relax(); } + /* Early fixups are done, map the FDT as read-only now */ + fixmap_remap_fdt(dt_phys, &size, PAGE_KERNEL_RO); + name = of_flat_dt_get_machine_name(); if (!name) return; |